If we're not supporting 2.7, why am I still testing against it?

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
  strategy:
  fail-fast: false
  matrix:
- ruby: ['2.7', '3.0', '3.1', '3.2']
+ ruby: ['3.0', '3.1', '3.2']
  steps:
  # Use a cache for our tools to speed up testing
  - uses: actions/cache@v3